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 Post subject: Cracked Carbon Rim???
PostPosted: Sat Mar 12, 2011 12:09 pm 
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Joined: Sun Aug 09, 2009 2:57 pm
Posts: 61
Location: Colchester, UK
Hi,

Can anyone help?

I have been given a carbon rim which has a small crack in it and I don't know if it can be repaired or is a total waste of time?

http://www.flickr.com/photos/43616654@N03/5519027607/

If anyone could help with advice I would be really grateful.

Cheers,

Richard[/img]


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 Post subject:
PostPosted: Sat Mar 12, 2011 8:57 pm 
Retro Guru

Joined: Mon Feb 01, 2010 8:57 pm
Posts: 774
That looks like impact damage - unless you can inject some polyurethane 'structural' foam inside the rim to prevent crack propagation, then it'll likely fail in short order. Try getting a second opinion from on of the carbon frame repair specialists.


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 Post subject:
PostPosted: Sun Mar 13, 2011 5:14 am 
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Joined: Mon Jan 15, 2007 12:12 am
Posts: 1513
Location: Gold Coast Australia
I repair carbon frames all the time and I think you may be lucky with that rim , the crack is away from the brake surface and spoke holes, Did that damage happen whilst it was a built up wheel? some PU foam inside and a patch may make it a heavy spot ? just a (carbon/ epoxy) patch with the top layer 3K plain carbon at 45 deg should be enough to fix it but the "weave" will be interrupted. A small mould could be made off an adjoining section of rim (not where the sticker is) and that be used to clamp against the wet patch which would compress it slightly and minimise sanding that is needed after cure . Lats


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 Post subject:
PostPosted: Sun Mar 13, 2011 1:22 pm 
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Joined: Mon Feb 01, 2010 8:57 pm
Posts: 774
Remember, you can buy new carbon rims from China for as little at $150 so be wary about the economics of repair


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 Post subject:
PostPosted: Sun Mar 13, 2011 11:40 pm 
Retro Guru

Joined: Mon Jan 15, 2007 12:12 am
Posts: 1513
Location: Gold Coast Australia
agreed on the economics statement but a china/ebay/alibaba/gigantex etc rim is not a corima IMO


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 Post subject:
PostPosted: Fri Apr 01, 2011 3:53 pm 
retrobike rider
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Joined: Tue Jan 29, 2008 11:04 pm
Posts: 1799
Location: A wretched hive of scum and villainy...
Richard,

Not sure of the economics for you, but they guys at Corima have mended several discs and quads (even Zipps!) with far worse damage than that for us, at a very reasonable cost. Maybe £60GBP a wheel + postage.

They'd probably inject resin, patch and remould, along the lines of previous suggestions. They inspect first then quote if they think it's safely repairable, or return the damaged parts as 'un-repairable' for you to destroy...
Try Catherine Martin at corima@corima.com.

If no response, I might be able to do it through us as we're Corima dealers in the UK (just wheelchair/handcycle stuff, officially, though) I'm at dan@draftwheelchairs.com

All the best,


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